how do you make messages big enough to read?

How do you make messages big enough to read? My right message window suddenly shrunk to minuscule, and cannot be read.

How do you make messages big enough to read? My right message window suddenly shrunk to minuscule, and cannot be read.

Assuming I understand the question correctly: click that window to make sure it has “focus,” then use Control plus the “+” key on the numeric keypad to enlarge text in the preview area, or Control plus the “-” key on the numeric keypad to reduce the text size there. (This is also working for me with Control plus the “+” and “-” keys on the main keyboard.)