The off-canvas settings tray moves away from the right edge of the page when grabbing the resize handle and resizing the tray's width. This then causes the main content to resize in unpredictable ways as well.
It's possible this has something to do with Drupal.displace() calculating the offsets incorrectly.
Create a fresh site, enable layout builder, and set a content type to use layout builder. Edit a node via layout builder and add a section. When the settings tray appears, grab the left side handle and drag it in and out a couple of times. You will see the tray jump around and offset from the right side. This occurs in both firefox and chrome.
Active
10.1 ✨
We see a very similar behvior in our Drupal 10.1.7 sites. Every time I let go of the handle for resizing, the Layout Builder panel jumps a bit to the left. Apparently, its position is computed and then set as "x pixels from the left". If the panel is supposed to be shown on the right side, why is it not positioned as "y pixels from the right" (y being the width of the panel)?