How do I constrain a crop to a perfect square in Lightroom Classic?

[Ken Nielsen]

I see I can constrain aspect ratio by right-clicking on the crop in Lightroom Classic, but nowhere do I find ability to tell Lightroom to maintain same side measurment on all sides of a crop. Is this possible? How do I attain? Is it possible to enter the pixel numbers for a crop? Things I've always wanted to know but never asked. It's time to find out what my abilies are for this. 

TIA,

Ken

[DdeGannes · Accepted solution]

LrC is a non destructive editor i.e. It will not ever physically apply changes to the original file, the edits you apply to an image is data stored in the Catalog file.

You use the crop tool to apply a specific aspect ratio so if you wish aspect ratio which will be equal on both width and high you simply select 1x1. Then you move the crop box to choose the area you wish to be retained. Then, if you wish an image file with specific pixels or inches you would need to export the image  an choose your needs e.g. 3000x3000. Pixels, Inches or CM and Lightroom will resize the image accordingly and create a new image.

[Ken Nielsen]

Very straightforward and complete answer. Thank You very much.