I notice a strange anomaly that I will report here in case another user runs into it. I am on Zorin 18 and I am using the auto tiling desktop, and I notice when I open any dialogue window for the first time in LibreOffice apps, the dialogue window is very tiny. In fact, if you are in full screen mode, you may not see it at all, as it tends to open mostly 'off screen' and only a tiny sliver of the window is visible.
Once you manually resize the dialogue box or use the keyboard to send it to the tile you want, it will resize and stay resized when you open it again.
I noticed this while making a form in LibreOffice Base and made a quick recording to illustrate what it's doing and how to fix it. I have since tried a few other LibreOffice apps and see the same issue, but again it's easy to correct.