You may try to read the manual then, with 'man tic80' or 'tic80 -h' or 'tic80 --help'.
Viewing post in Linux 64-bit tic80 -fullscreen not working
tic80 is just a binary file of 10MB. You just download the archive, extract and that's it. No installation, no documentation and tic80 -h or --help just output the message that the parameter is not supported.
The documentation online says -fullscreen is the switch but it is not working. Maybe some developers can help?