Hi @영훈 정,
Welcome to Microsoft Q&A!
To change the color of the scroll bar, you can try the following:
Step 1: please right click on the scroll bar > Scroll Bar Options… > check “Use map mode for vertical scroll bar” > OK.
(You can ignore the option “Source overview” or change it to Off.)
Step 2: Please go to Tools > Options > Environment > Fonts and Colors > Display items: Overview visible > change the Item background to the color you like > OK.
Sincerely,
Anna
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