How do I increase the font size for entering bills, etc?

you can not do that unless you enlarge the entire display

ctrl and the + key will zoom in

ctrl and the 0 key will restore to normal display

When entering bill under banking, writing a check, the font is so small, how can I increase the font size for this and for positing deposits.  I can increase the font for reports, such as BS, P&L and GL.

Thanks!

I can show you how to increase the font size when entering bills and writing a check, @Beach2.

You can increase the font size using the Ctrl key on your keyboard. Just simply hold down the Ctrl key and press the + (plus sign) to increase the font size.

Also, pressing the Ctrl key and - (minus sign) will decrease the font size. 

If you'd like to reset the font size to the default size, you'll just have to press Ctrl+0 (zero).

Here's a guide on how to enter and pay bills and on how to write checks in QuickBooks Online.

Let me know if there's anything that I can help with your account. I'm always here to assist.