resolution - since 2019 update illustrator's menus, tools and swatches are too big?
It seems like it can't tell its on a 5k monitor?
See comparison below.
Illustrator 2019 compared to indesign 2019
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Daniel Crabbe
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Starting CC 2019 we are scaling the user interface a little on high resolution devices. To turn that off please use the small value as described on this page to get back the behaviour of previous release.
https://helpx.adobe.com/illustrator/using/customizing-workspace.html#Scaletheuserinterface