Disabling features that can lead to distractions permanently

In today's world, getting distracted by a mobile phone has become easier than ever. I wanted to have a phone that only has calling and messaging (by SMS) features. Switching to a feature phone(keypad phone) won't solve that issue as most of them are coming with games and social media apps preinstalled. There are products like lightphone in the market that are good alternatives, but they are relatively expensive. Also a more sustainable approach would be to convert an already existing smartphone into a suitable one. Uninstalling distracting apps or installing screen time controlling apps were not effective, I just installed or uninstalled them respectively in a few clicks. I understood that changes have to be made at the system level, in order for this to actually work. So I permanently uninstalled apps like play store and bloatware with the help of ADB. I'm having one last problem - I can just go and create a new user and continue to use the apps that came with my phone. So I tried to permanently disable this feature by following the instructions in this answer. It worked, but the problem is after rebooting, I'm able to create new users again. Even after adding the following two lines in the **build.prop** file, the issue is persisting. fw.max_users 1 fw.show_multiuserui 0 What's interesting is the following command gave no output despite the above 2 lines being added in the build.prop file in the system folder. I even double checked whether those lines are actually present after rebooting with the help of a file manager that has root access. adb shell getprop fw.max_users My question is **how do I permanently remove the feature of user addition?** If that is not possible, at the least how do I stop certain apps like play store being installed in newly created user profiles? I'm using Mi A3 running lineage OS 22.1-20250112-UNOFFICIAL-laurel_sprout (android 15), rooted with the help of Magisk 28.1. I have installed twrp-3.3.1-17 in recovery. I use raspbery pi 4 to help me with the process. I did all this with the help of interent and I'm basically a noob. Please help me.