Display full scroll bar with arrow buttons in applications?

I'm not finding anything about this with searches, and the Google AI is like the dumbest kid on the short bus, so I'm turning here.

I have the OS Application Style set to 'Oxygen' which supposedly displays a full No Bullshit scrollbar. With arrows and everything, like in the old days, so I can just click the button, and the fucking page will scroll.

This setting is not changing any applications' scroll bars, nor is any other style. I'm using Libre Writer for something more than 2 pages, and if I have to grab the invisible scroll bar to drag it up and down manually any longer, I am going to lose my goddamn mind. This has possibly already happened.

I've looked at every possible setting. There's nothing about how the scroll bar is displayed, and again, it's every app. So please, for the love of God, someone tell me how to force full scrollbars on installed applications.