---> C:\Users\<Username>\Documents\Electronic Arts\The Sims 4 > Options.ini
Options.ini has a uiscale parameter in line 4
like this: uiscale = 100
This value (100), you change in small steps until it is readable/usable.
Smaller values make the ui bigger (like 90,80,...50,etc) and bigger values make it smaller (110,120,etc).
Of course, the parameter changes the complete ui, so not only the color stripes will get bigger/smaller, the texts and symbols change too.
:Warning:
Changing the UI resolution can cause game problems primarily with paintings and their auras and photography skill.