P:(Masking) Invert/Flip Mask Group

It's a kind of weird but I didn't find any Adobe suggestion or tutorial about inverting a complex mask.
I figure out the solution you can find in the attached video (starting from minute 4:40) but I wonder if it's the right method (sorry but the video is only in Italian language but I hope you can get the method just looking the screen).
Can someone tell me if there is a shorter and most intuitive process to do the same?

If the method used is the right one, why we don't have a button to automate it?

Thanks in advance.

https://youtu.be/vDEJuSnyyww

Its a super simple TWO step rule

1. Right-Click on the BOTTOM Mask Component and chose "Invert" from the menu"

2. Right-Click on EACH of the Mask Components ABOVE the Bottom one.  You don't even have look at the icons to see if it was originally Added or Subtracted, just pick the second item on the menu.

If it was originally Added it will show this.  Pick "Convert to Subtract"

If it was originally Subtracted it will show this.  Pick "Convert to Add"

I thank you for adding the steps here with pictures... but I'm still in the dark on this whole subject, the "who what why when where and how" in actual use and seing what is being accomplished in actual working, I think, could only really be accomplished in a methodical and step by step video. I take it that none exists. I will try the steps you mention here Michael, but without having a clue what I am doing or why... You would honestly think this would be easier, like adding to a mask or erasing on a mask in Photoshop... Not the case in what we are working with now in Lightroom and I don't really know why. Thanks for doing this as maybe by messing with it some bells will go off and I will actually learn something.

Yep, same

Take a different approach

Two ways

Creat the initial mask, Do not Add/Subtract just yet. Invert the mask, then Add/Subtract

Or you could create the initial mask, copy it, invert the copy, continue.

Oh, a new idea? Flatten Mask? I think I will go and post that.

I like your new masking feature in Lightroom. Thanks a lot. I have one observation and suggestion. Say I choose the option to mask using select object and the selection is 90% correct but I have to do a bit Add and Substract to get it right.

After that I am unable to Inverse the masking. The invert option is for the original subject selected which was only 90% correct.

Mac OS 11.6, Lightroom Classic 11.0. - When I select my 'completed' mask, both the Lightroom selection of the subject and the brush strokes I've added to it, the 'Invert' box is covered and not available. My aim is to now select the background which is outside of the mask I'v made, but without the 'Invert' box I cannot make this choice. How can I make this work? I've included a screen shot of the subject, Mask 1,  and added brush strokes showing on the image and in the mask pallette to help clarify.

TIA,

Ken

I propos a list of improvement that I think can improve the workflow with the new masking panel:

1. Invert a mask: Add the possibility to invert a complete mask groun and not only the single selection tools.
2.  Change the Add/Subtract mode after creation: Add the possibility to change the sum mode (Add/Subtract) from the masking panel, for example by using the ALT+click over the small icon of the mask.
3.  Easy creation options: Add the possibility to add new mask in easy way without click in the mask panel in order to simulate the old workflow (with previous version, using gradient or rdial filter was possible to add multiple contribute simply by cliccking).
   So I propose to have a similar behavior when you select Linear Gradient and Radial Gradient that permit to "continuous" drawing new mask (for example without ALT in the same group and with ALT in a new group). This behavior can be controlled by a flag. 
   I know that is present the shortcut, but the short cut waas slowest and different from Lrc, Lr and Cr.
4.  Auto rebuild of AI mask after syncronization: Add an option that enable the auto-recalculation of the AI mask when this mask was copied or synced in a new photo.
5. Add the possibility to indicate the subject: As alreeady present in photoshop from the previous version, I think that can be interesing add some features to the subject selection tools. For example add the pre indication of the subject or the area subject selection tools in order to guide the Sensei to select the object that we want.
6. Add the shape selections tools: Add an istrument similar to the "Lasso" selection tools to create a custom shape selection. Moreover add the possibiliti to "feather" the selection.
7. Add the Feather controll of a Mask group: Similar to photoshop, please evaluate the possibility to add the feather control of a complete mask group. 

I thinks that this new instrument was very powerfull but whit some imprevement can be super!

Hello,

I LOVE the now "select subject" option for masking! Of course, it does not work perfectly. So you have to add or substract parts to/from the resulting mask by using the paint brush. When you try to reverse the completed mask afterwards (for instance to work on the background of the subject instead of the subject itself) it only reverts the added/substracted area, but NOT the automatically selected subject! This is a big problem, as reverting a mask is one of the most needed features when working with main subjects. 

How can I reverse the whole mask? I tried to reverse both parts separately (subject and brush) but that doesn't work either. 

Looking forward to your help,

Foto-Curly