I’m sorry, I don’t understand English. The following content comes from a translation tool.
The program interface is very attractive, but I’ve encountered an issue. When I switch between different sessions, a blue border appears on the left side of the program window, which really detracts from the overall appearance. However, if I move the window or close and reopen it, the border disappears.
So I suspect this might be a bug rather than a setting. Here is my system environment:
Version Windows 10 Pro
Build Number 22H2
Installation Date February 27, 2026
OS Build 19045.6466
System Language: Simplified Chinese
Program Language: Simplified Chinese
Screen Scaling and Layout: 125%
Resolution: 2560×1440
Screen Size: 24"
I hope this information is helpful.

Sorry, since Unigram doesn't allow screenshots, the photo came out a bit blurry.
I’m sorry, I don’t understand English. The following content comes from a translation tool.
The program interface is very attractive, but I’ve encountered an issue. When I switch between different sessions, a blue border appears on the left side of the program window, which really detracts from the overall appearance. However, if I move the window or close and reopen it, the border disappears.
So I suspect this might be a bug rather than a setting. Here is my system environment:
Version Windows 10 Pro
Build Number 22H2
Installation Date February 27, 2026
OS Build 19045.6466
System Language: Simplified Chinese
Program Language: Simplified Chinese
Screen Scaling and Layout: 125%
Resolution: 2560×1440
Screen Size: 24"
I hope this information is helpful.