In Edit table layout you choose under Header whether column headers are shown on one or two lines, and whether the filter and sort buttons sit on the same line as the header or on a separate line. The setting applies to the table you are in and is saved in the profile.
How to do it
Click Table layout at the top of the table.
Click Header.
Check or uncheck Show header on two lines. Two lines let long column names show in full. This is on by default.
Check or uncheck Filter and sorting on a separate line. This is off by default.
Click Save layout.
Good to know
If a column name is cut off, you can hold the mouse pointer over the header to see the full name.