Content Properties window too big/can't be resized smaller (Ubuntu/KDE)

[virtualritz]

I am using Scribus 1.5.8 on Ubuntu 22.04 running a KDE Plasma desktop.

I do not have a Text tab in my Properties window when I select text in a text box (this is a brand new install of Scribus). This may be another issue I should open, maybe?
As a workaround I use the Content Properties window instead.

I can't resize this window smaller vertically or horizontally from the initial size when it comes on screen.
Making it bigger is possible (but pointless, as you can see in the screenshot below).