Greater Web Panel width
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For those of you who want/need it, there is a way to get Web Panels to open at a greater maximum width, if you're using the UI at around 100% zoom or so.
Go into Settings, then Appearance. Lower the User Interface Zoom to 50. Open the Web Panel you want to be wider, and drag the left side as far as it will go (note the Web Panel should be set to floating, otherwise do this part in another tab). Repeat as needed, then reset the UI zoom to your preference. The selected Web Panel(s) will now open much wider than the maximum amount allowed for that UI zoom setting.
Note that if you do use 100% UI and drag the Web Panel as far as it will go at 50%, when you go back to 100% the Web Panel will actually be greater than fullscreen, so you'll need to play around with either the UI zoom setting, or how much you drag the panel. Also, if you try to change the width of the panel while at your preferred UI level, it will revert to the maximum width for that setting. But otherwise it will stay that width.
FWIW, I use a UI at 70%, and I have Web Panels that'll open up to around 4/5ths of my screen.