Hi, sometimes I experience this too. I click on a part in the assembly and it is not get highlighted.
- If I restart Solid Edge it usually helps .
- Maybe update your graphic card driver.
- Empty windows TEMP folder. Close all windows, then enter this in the windows Explorer : %temp% and delete all files and folders (the system won't allow to delete some, so just skip them when prompted)
Since you've been using Solid Edge has it always behaved as you show in the photo? If so, I think there's an issue with your system. I've tried changing settings to make my system not highlight the part like yours and I can't do it. It always highlights, depending on my settings, either with a glow, or just the edges highlight.