I've had good luck using the Belkin USB 1.1 4-Port Hub F5U045 with both the Acer 232Hl and 272HL to get around the buggy VIA USB 3.0 chipset when connecting to the Raspberry Pi 3B+.

I've had the same touchscreen problem with both the Acer 272HL and the Acer 232HL connecting directly to the Raspberry Pi 3B/3B+. The only reliable cure for the buggy VIA USB 3.0 chipset in the Acer monitors that I have found is to put a USB 1.1 hub between the RPi and the Acer 2*2HL. I've had very ...