There is no way to change screen resolution of Linux machine which is running on Hyper-V virtual machine.
Even if you have installed hyper-v Linux integration software you can’t change the resolution from display settings. Here is alternative method of how to do it quickly. let’s check how to change Linux screen resolution in Hyper-V virtual machine
1) Open the terminal
2) edit the grub file
following example was done at Ubuntu
sudo vim /etc/default/grub
3) Set resolution
Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT (line is highlight on image) and add video=hyperv_fb:[the resolution you need]
you may need to change the above value several time to achieve better screen size. 1200×700 is the value which is worked on my 1366×768 resolution windows server.
4) write and quite (wq) from the editor
5) Execute following command
and reboot the Linux machine