Several
Get the small bags, small hotbars and the mook-style windows with less flair around the edges to keep things visible. My secondary laptop is a 1440x900 Dell 9200, so I know where you're coming from with this request. That's why I use the smaller versions of those windows.
I also use Fetish Player, Group, Target, Implied Target, mooked examine windows and bank/inventory/market windows for space savings. Just look around the individual pieces and find the smaller variants of many of the mods.
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