Environment

• TeXstudio: 2.12.16 (git 2.12.16-108-g1786d152)
• Qt: 5.12.2
• OS: Linux Mageia 7
• TeX distribution: TeX Live 2019

Expected behavior

"Show Only Monospaced Fonts" choice in menu Options → Configure TeXstudio... → Editor is persistent. Hence, the user who wants a monospaced font¹ but doesn't know which one to choose, doesn't have to re-enable this option at each trial.

Actual behavior

"Show Only Monospaced Fonts" choice in menu Options → Configure TeXstudio... → Editor is not persistent.

How to reproduce

1. Visit the menu Options → Configure TeXstudio... → Editor.
2. On this window, enable "Show Only Monospaced Fonts".
3. Click on OK.
4. Visit the menu Options → Configure TeXstudio... → Editor.
5. "Show Only Monospaced Fonts" is not enabled.

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¹IMHO, monospaced fonts should be the default at least since, with other fonts, LaTeX → Manipulate Tables → Align Columns looks to be not working.