I use a little 7” LCD display I got from Amazon that’s clearly intended to sit on a car dashboard but works very nicely as a debug display and takes basically no space. Just don’t expect optional extras like “viewing angles” or “image quality”.
Give me you favourite FPGA screen. Only requirements are it works with Xilinx Zynq and supports 640x480 by DVI over HDMI. I started working on my GPU again, but I won’t have a computer monitor for months and would like a simple screen I can just connect via HDMI and power somehow