RedisInsight: can't set gui port

I’ve followed the instructions here (Configuring RedisInsight | Redis Documentation Center) to configure the RIPORT, and I’ve confirmed (echo $RIPORT) that it’s set to the port I need, but when restarting RedisInsight it opens up again on the default (8001) port.

Anything I need to be doing other than export RIPORT=7001? is there something I need to add to PATH?

Any suggestions? I’m using .zsh on MacOS.