Welcome to SMATH
I see nothing wrong. As a matter of fact, you are showing ALL of your toolbars which some of us are not https://en.smath.com/forum/yaf_postsm66251_Missing-symbols-on-Ubuntu-20-mono.aspx#post66251. How did you set up your computer?
If your like me, I was having an issue with the dark/black background. Assuming Linux Mint, I had to adjust for a light theme. The only place I could find it was the "Welcome Screen"
Make sure the toggle is on the "sun"
