Hello , sorry about your problems. My name is Marco and I will do my best to help you.
As Chien Sage said, you can use the mouse wheel to scroll. The fact that few people click directly on the scroll bar made Microsoft make this decision.
Windows 11 aims to provide a sleek and modern user interface. Narrower scroll bars contribute to a cleaner and less cluttered appearance, which is in line with current design trends that emphasize minimalism.
The design changes in Windows 11 also cater to touchscreen devices. Narrower scroll bars can be less intrusive on touchscreens, where users often rely on gestures rather than precise clicks.
However, you can change the size if you wish.
Open the Settings app.
Navigate to Accessibility > Visual effects.
Toggle the Always show scrollbars option to On. This will make the scroll bars more visible and slightly wider.
Otherwise, if you are a more advanced user, you can go to the registry to change the size.
Open Registry Editor by typing regedit in the Run dialog (Win + R).
Navigate to HKEY_CURRENT_USER\Control Panel\Desktop\WindowMetrics.
Modify the ScrollHeight and ScrollWidth values. The default value is -225, which corresponds to 15 pixels. Increasing this value (e.g., to -450 for 30 pixels) will make the scroll bars wider.
Sign out and back in or restart your computer to apply the changes.
---Before any change in the registry, I advise you to make a backup https://support.microsoft.com/en-us/topic/how-t... ---