Change font into bold.

Mr_Nair wrote:

Is there any way that can change the font in to bold everywhere? Like you could do it in iPhone display settings?

Not like iPhone.

See your >System Settings>Accessibility> for available options

Not to set default to bold but there are several other settings you can change to make text more readable.

System Settings > Accessibility > Display

You can increase contrast and change default text size and various other settings. Try experimenting with them one at a time to see what effect they will have.