PS4 UI too small, can't figure out chat box

[Mhaeric]

In Character Configuration -> Log Window Settings there's a font size drop down. You can resize it by using the top right corner.

This only affects the chat log, not NPC dialog boxes by the way. Those are currently fixed in size if that's what you mean. Add your voice to the several threads already in feedback if this is the case.

You can increase the size of font in other menus that aren't in the HUD layout in the same way as during HUD layout. Ctrl-Home on a keyboard will cycle through the sizes for the window that has focus, whether in or out of HUD layout mode. I'm not sure if there's a controller equivalent. This will work for your option menu for example.