OpenLens extension to change font to monospace, specifically: 'JetBrainsMono Nerd Font', 'Cascadia Code', Consolas, monospace.
In OpenLens, navigate to the Extensions list. In the text box, enter the name of this extension:
openlens-mono-font
Click "Install", and after a few moments, the plugin should appear in the list of installed extensions and be enabled.
You may need to restart OpenLens if you don't see changed fonts.