Can I change calendar settings?

Since my latest update (I don’t know how to tell what version I am using) the grid on my calendar is so faint I can’t tell the various days apart. This is a significant problem when in the “Month” view. Can I fix that?

It is also harder to schedule events: I have to use the drop down menu to set times instead of simply clicking on the hour or minutes and typing in the desired time. Is that customizable?

Are you using a custom theme? Did you try to use another theme from the built-in themes list in eM Client?