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Also what community plugins do you have installed, if any? Perhaps one is modifying your settings in some way.
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In your screenshot, is it all text that has doubled in size? Or just the orange heading text?
change of the resolution should look like zooming, isn’t it basically the same thing?
Not really, no. Zooming makes the elements bigger. Resolution is related to how many pixels are rendered on your monitor in a given space. If the “resolution” was changing, you’d likely be seeing blurriness or pixels.
I think you just have some glitch with your CSS or theme or something. This is not related to your computer resources.
Rather than reinstalling Obsidian over and over, you may need to delete the .obsidian folder in your vault(s). This is where your Vault settings are stored. If you do this, save a full backup of your entire vault somewhere safe, first.
If you reinstall Obsidian, that .obsidian folder will still be there, and any glitchy settings will still be there.