You are tired after a long stretch at work and must read through another document before calling it a day. To give your eyes a rest or improve comprehension you could go to View $>$ Learning Tools and choose the following the help:

a$.$

Read Aloud

b$.$

Column Width

c$.$

Page Color

d$.$

Line Focus

e$.$

Text Spacing

f$.$

A and B

g$.$

C$,$ D and E

h$.$

All of the above