If you are using older versions of TablePress, you can continue using the Extension.
Some people have a lot of content in individual cells and would therefore like to have larger text fields on the “Edit” screen of a table. The Larger Edit Input Fields Extension can achieve just that.
Just install and activate it like a regular WordPress plugin. The text fields on the “Edit” screen will then be wider. If you want them to be even larger, just change the numbers for
min-height in the source code of the file