If we’re being entirely honest just about everything in the zstd ecosystem needs some basic UX love. Working with .tar.zst files in any GUI is an exercise in frustration as well.
I think they recently implemented support for chunked decoding so reading files inside a zstd archive (like, say, seeking to read inside tar files) should start to improve sooner or later but some of the niceties we expect from compressed archives aren’t entirely there yet.