The new mouse and trackpad support coming in iPadOS 13.4 is just fantastic. And, in typical Apple fashion, it just works as soon as you connect a trackpad or mouse via Bluetooth or USB. But there are also plenty of options to customize how the mouse behaves, and even how the pointer looks.
You may already have checked the obvious options in the Settings app under General > Trackpad & Mouse. But several hidden iPad Pointer Control options offer even deeper customizations.