Have you considered sending a MR for the "very small" things that bugs you? GitLab team member here... I have a personal list of things I wish will be prioritized, but there is only much you can do with the scope the application has and the amount of coworkers. So when things really piss me off, I reserve some time and send a MR to fix that.
That's what I've done before joining the company, so it works ;)
That's what I've done before joining the company, so it works ;)