Lightroom Classic - Remove Tool missing Apply button

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"now, even when I click ADD, then the only option to process my mask, is Remove.....and everyime, it is doing just that, removing every time."

Rereading your posts, I'm still confused as to what you're seeing and thus whether your LR is misbehaving or you misunderstand how Remove works.

When you first click the Remove tool and then Remove mode and select Use Generative AI, you should see this:

After you use the brush to make your selection, it should be highlighted in red and you should see this:

The Add and Subtract buttons are toggles affecting the action of future brush strokes.  When Add is selected, then subsequent brush strokes you make will be added to the current selection:

When Subtract is selected, then subsequent brush strokes will be removed from the existing selection:

When you've got the desired selection, then click Remove, and it will then attempt to remove the object you've selected:

If you're seeing behavior that doesn't match this, then rather than playing 20 questions, the most efficient way to communicate what you're seeing is to make a screen recording (not a phone video) and attach it here (it's really easy):

https://www.descript.com/blog/article/how-to-screen-record-on-windows