Can't resize editor window in Spyder
Solution is:in spyder widow go to View -> window layouts -> spyder default layout.
This worked for me.
I closed and reopened Spyder, and somehow my windows were resized the way I wanted. I'm not sure how that happened, but I locked my panes in this configuration, so hopefully it'll stay this way.
If you can't click on bottom right corner and drag it down, you can go to the View menu and select maximize pane. It may become too wide but easy to narrow. Works for me anyway.