WinSCP follows system scaling. If you set scaling to 200%, WinSCP will display 200% icons.
Most new laptops and tablets offer resolutions above 1080p.
The problem is that running WinSCP on them especially for touch screens means that the toolbar icons and menu items are too small to use.
Please can you;
1. Have an option to increase menu font size as you have done in Panels -> Panel Font.
2. Have an option to increase the size of the toolbar icons from Small, Medium, Large, Extra Large, Extra Extra Large (necessary on 4k touch screens).