Note size and lyric size

The size of notes increase together with the staff line distance as being set view Style > Page settings. Lyrics increase along with that, but can get increased also independently via their Text style

There are several ways to increase both. On one staff you can open the staff/part properties and increase scale. You can make the entire score larger by opening page settings and increasing the scaling. If you only want the lyrics larger you can make the font larger in style.