It seems that the new Ribbon interface has several bugs (probably an update will come soon). So, not only the Export As is not working, but I see that (at least in Windows), opening a worksheet with a large output will display the output using the Maple input font.
Just save a .mw with the content:

expand((x+1)^200);

and then open it.

In the File menu,  the Export As dialog is missing. Only the default (.pdf) can be used; no .mpl or .tex)
The Save As dialog is incomplete (e.g. save to .mws).

Or, is the installation corrupted?

I noticed a strange (for me) appearence of a dollar:

I know $ as an end of parameters marker, but here its role seems strange.
Is it a typsetting issue?

The function

f := sin(x)/sqrt(2+sin(2*x));

has a simple elementary antiderivative but int(f,x) is huge and not elementary. What method would you suggest to find it?