I'm on an on prem Rio 11 setup and going through the process of evaluating the lift required to move from Forms 11 update 2 and Forms 11 update 3. The forms I'm working with are using Forms Designer/modern designer and not classic designer. One of the major roadblocks I've made note of and haven't been able to find a quick workaround for is that tables that use hidden fields are no longer use the full width of the screen. It seems the hidden fields are now given a portion of the screen width. You can see this clearly in the code that the hidden fields now have width percentages assigned to them in colgroup.
LF Forms update 2
LF Forms update 3
My question is does anyone have a quick CSS or javascript fix for this issue?