macOS external monitor with very big slider

crik91 wrote:

Hi, I bought an external 4K monitor, currently connected via USB-C to USB-C. I instantaneously noticed that there are differences in the interface, I notice it especially in the Finder where I see these huge side bars that in the built-in monitor instead are a simple vertical line, barely visible.

Can these be made visible as they are on the main monitor? You can see it in the screenshot attached.

https://discussions.apple.com/content/attachment/3a1e9ac5-c685-46c8-a418-34f768a9da6b

Thank you

Try List view and compare your results...

Get to know the Finder on your Mac - Apple Support

Organize your files in the Finder on Mac - Apple Support

What is the resolution of the external monitor compared to the MBP? It might be at a lower resolution thus making everything larger, including the dividers between the columns.

As a test boot into Safe Mode according to How to use safe mode on your Mac and check to see if the issue persists. Reboot normally and check again.

NOTE 1: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

NOTE 2: if you have a wireless keyboard with rechargeable batteries connect it with its charging cable before booting into Safe Mode. This makes it act as a wired keyboard as will insure a successful boot into Safe Mode.

Also have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

crik91 wrote:

Solved.

Settings -> Appearance -> Show scroll bars -> During scrolling

Good computing crik91 —

I will admit your original screen shot with the bold red highlights really confused what the issue was.