It would really help us to help you if you provided more info, what version of Photoshop and OS do you have and systems specs would help too.
Without knowing this info we really can help, so please provide as much information as possible
Have you tried resetting Photoshop preferences and updating your GPU driver from the manufacturers website?
To restore preferences quickly using a keyboard shortcut: Press and hold Alt+Control+Shift (Windows) or Option+Command+Shift (Mac OS) as you start Photoshop. You are prompted to delete the current settings. The new preferences files are created the next time you start Photoshop
About the small icons that's more than likely related to you using a older version of Photoshop like CS5/6 on a 4K monitor
Check will this problem be gone when you dock your 'Tools Bar' to left edge of workspace and share with us this info
You’ve probably tried this already, but go to Window menu > Arrange > Consolidate to tabs
Thank you for your reply!
I'm using Photoshop CS6 on Windows 10 Home/Dell XPS 15 9560. It's a 64-bit operating system, with an i7-7700HQ CPU.
I tried the Alt + Control + Shift method, but it didn't work. I also tried updating the system, but to no avail.
Docking the toolbar didn't work. Thanks for the rec, anyways!
Thank you for the recommendation, but this didn't work.
I suggested it as thought maybe you use CC2018, however there is a little different behaviour. This one I see first time ever.
It may help, but if he doesn't want documents be opened as Tabs?