:repl-options has an :init key. That’s where you need to put such code.

@bozhidar

✦ ➜ lein repl
If there are a lot of uncached dependencies this might take a while ...
nREPL server started on port 43689 on host 127.0.0.1 - 
REPL-y 0.4.3, nREPL 0.6.0
Clojure 1.10.1-beta2
OpenJDK 64-Bit Server VM 12.0.1+12
Welcome to the magical world of the repl!
core=> *print-namespace-maps*
true
core=> (do (set! *print-namespace-maps* false))
false
core=> *print-namespace-maps*
false
core=> 

it works

Yeah I think I got it working too when I put in my project.clj file. I might be doing something wrong when trying to put it in my .lein/profiles.clj but that's ok for now. Thanks!