Hey there ANSUKURO,
This was a bug in a previous build of the game. If you are using a Wide or Ultra Wide resolution then the button is not rendered.
I have solved this problem in later builds, but you will have to change your screen resolution to a 16:9 ration.
For example, 1920 x 1080 or 1280 x 720.
I know this is a real nuisance, but I am working on getting a new build out within the week and this is a major priority for me to fix ASAP
Could you please reply with your resolution? I will be sure to test it when prepping the next build.
Thank you for your patience.
Kind regards,
iLEWD