unable to change interface size of taskbar and toolbox in cs5 photoshop.

I installed a used cs5 on my windows 11 pc. Everything appears to work fine except in photoshop the taskbar and tool box are very small. I've gone to preferences interface and selected large and restart. no change. even uninstall reinstall didn't help. In settings I kept the high resolution but changed magnification to 200% but still didnt work. In illustrator I see the results I want but no so in photoshop. Updates completed. Any ideas please?