i dont seem to find any setting to control the font size in the code blocks of the sidebar chat. neither editor font size nor chat font size seem to have an effect. always stays the same. also after reloading window or closing and reopening cursor altogether.
since Cursors is a fork of VS Code, nope, there’s no way to tweak the UI font
but you can change the font of the terminal and editor
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i didnt know that the sidebars in vscode have fixed sized fonts 
windsurf did some little tweaks in terms of layout, spacings and font-sizes and it looks so much cleaner and easier to read. hoped i could simulate this in cursor.
Hey, the font size in the Chat window isn’t adjustable at the moment, but you can resize the entire editor interface.
VS Code introduced a window.zoomlevel setting to persist the UI size that may help and this is exposed in Cursor Editor Settings under Window called Windows.Zoom Level. Search for zoom in editor settings and you should find it. I have mine set to 0.6 on my 1440p monitor and that works fine for my crinkly old eyes 
There’s also a Window: Zoom Per Window to help with finer granular of UI sizing. It’s all rather neat and may help those who wish to customise Chat window size, but I haven’t experimented with it.