The correct convention for displaying measurements in text is to have a space between the number and the unit such as 10 m. When presenting attribute tables, in a layout for example the "m" often gets split onto a new line if you have fixed column widths. Is there a way to keep the number and its unit together?
As shown below, the second row doesn't look great.
Depending on how you defined the value and where you use it, you might have accidentally entered a space for Wrap on character that converts the space into a line break:
The label is generated here with the expression value || ' m', where value is the field containing a number. So the label would look like 1.6 m, however, when a space is entered in the Wrap on character box, you will get a new line instead of the space. As the space is invisible, this can generate confusion.
So if you have a linebreak in a textfield in the attribute table, you can remove it by either manually delete it or use field calculator with this expression:
replace ("field_name" ,'\n' ,' ')
It replaces a line brake ("New line" marker '\n') with a space.
replace()with a regular expression. If you are talking about a representation of the attribute table contents e.g. in a print layout, you have more options.