Cannot switch back to multiple files open at once. HELP

Describe the Bug

It seems to have stepped into a mode where only one text panel can be opened.
How do I go back to normal? It really breaks the mode of having 4 or so panels open for the area you are working on. Please can you not break the UI so much - minimise etc disappearing earlier. I may have to go back to VSCode at this rate.

Steps to Reproduce

Open editor. Only one text panel open at a time.

Expected Behavior

Multiple text files open at once.

Operating System

Linux

Current Cursor Version (Menu → About Cursor → Copy)

Version 1.0.0.0.0.0.0.0.0 Ubuntu

Does this stop you from using Cursor

Yes - Cursor is unusable