I believe if you hold shift while clicking it paints the square a different color
Square highlights

Maybe a feature to change the default highlight color and/or control the which color the key binds relate to would be helpful. Not sure if this exists already or the level of effort required.
But if you move it will diserpearred
It saves it to the move you drew the arrow on

The bothersome thing is blue and green is consistent between squares and arrows. But Crtl+right click and just a right click for the red and orange colors are swapped when highlighting squares or arrows. I.E. default right click is red square, but you must hold ctrl to draw a red arrow, and vice versa for orange. Is there a way to customize this so it can be consistent?
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Hello. I think that the red highlight that appears when you make a right click over a square isn't useful enough. The red color means warning but sometimes we want to right click not because of a warning or danger but because we want to indicate an outpost or something else. I would like that chess.com could change this to a simple circle or a different way to highlight this. What do you think?