Font Size in Drop Down Boxes

I assume you are using Data Validation with a dropdown list. It looks like you have your view zoomed out, which shrinks the font size of a dropdown list.

There is no way to directly adjust the font. There are two strategies:

1. Reduce the size of the fonts on your sheet, and zoom back in
2. Use a ComboBox instead of data validation

I can give more details for either if you attach your file.

The paper clip icon does not work for attachments. Instead, under the text box where you type your reply click the Go Advanced button. On the next screen scroll down and click on Manage Attachments, which will show a pop-up window to Select and Upload a file. Then close the window.