Is there a way to bring back to dev mode after composer install --no-dev ?
Why do you want to have dev features? On a production/staging system no dev stuff should happen anyway.
When you mean on your local workstation/dev system, well, then a simple composer install (without the --no-dev should be sufficient.
Sorry for not being specific , I did a composer install --no-dev ( after yarn build:production) in the local sage dev folder , and uploaded everything except node_modules folder to my clients shared hosting (composer not allowed ). He suggested a few changes and when i tried to do it on my local sage dev folder its not showing off ( Think the production build is getting loaded ) . I just wanted to know how to make my local sage folder reflect the changes i make .