You can change the height and width size of scrollbars in Windows to be as thick or thin as you want.
This tutorial will show you how to change the size of scrollbars for you account in Windows 10 and Windows 11.
You can set the visibility of the scrollbar to visible or hidden for a profile in Windows Terminal.
This tutorial will show you how to hide or show the scrollbar of Windows Terminal profiles for your account in Windows 10.