I've got macOS Mojave 10.14.5 in which I run in VirtualBox Ubuntu 18.04.2. In Ubuntu everything is quite small as mac has high resolution. I found that setting display to 200% is ideal for me, but once I set the value if I change the window size of my VirtualBox VM the 200% settings got lost and I have again 100%. So I have to go again into settings and specify 200%.
How I can set it once and for all?