Will making the text bold on my iPhone erase and reset my phone settings?

I want to change the text to bold on my iPhone, but it says "applying this setting will restart your iPhone", does that mean all my content and settings will be erased that is on my phone or will my stuff still be there on my phone and the phone will just restart to apply the new changes

It isn't going to erase the phone just to change the default font settings. It has to restart to apply the changes is all it is doing.