SUMMARY STEPS TO REPRODUCE 1. Open several windows 2. Shift drag the title bar to place the windows OBSERVED RESULT I can see in the vertical separation between two tiled windows some pixels of width of a window below EXPECTED RESULT No space between two adjacent tiling panes. SOFTWARE/OS VERSIONS Operating System: CachyOS Linux KDE Plasma Version: 6.1.5 KDE Frameworks Version: 6.6.0 Qt Version: 6.7.3 Kernel Version: 6.11.0-5-cachyos (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 7 5800H with Radeon Graphics Memory: 28.3 GiB of RAM Graphics Processor: AMD Radeon Graphics Manufacturer: Trigkey Product Name: S5 ADDITIONAL INFORMATION See screenshot. The blue color indicates a gap, not covered by windows.
Created attachment 174529 [details] I can see some blue from the background image
You probably have padding enabled. Open tiles editor and see it in the top right corner. Set it to 0.
Thanks for your quick answer. How can I open the tile editor?
by default, it's meta (Windows key) + T
I knew of course the Meta+T, but I didn't associate it mentally with that name. That's true, I had a padding of 4. I didn't see that setting. Removed to 0.