Turn on Visual Edit
Click Visual Edit

The Visual Edit button

Where Visual Edit is in the builder
See the editing panel

Visual Edit is on
Change the words
Click the text you want to change

The sentence under the headline, selected

The whole builder with the sentence selected and its styles on the left
Double-click to edit it in place

Editing the text in place
Type the new text

The new sentence, typed in
Press Enter to save

The change saving
Change a style
With something selected, the panel on the left shows its styles. The Text section has the font, Size, Weight, line and letter spacing, alignment and more. Further down are Colour & fill, Spacing, and sections for layout, borders, effects and motion.Pick a new value

The Size buttons, with xl outlined

The sentence at the bigger size
Undo a visual change
The bigger size made the sentence wrap onto three lines with one word on the last line, so we took it back.Click the undo arrow

The undo arrow

Back to the original size, with the new text kept
Turn off Visual Edit
Click the Visual Edit button again (it is purple while Visual Edit is on), click Back to chat at the bottom of the icon strip, or press Esc twice.
The Visual Edit button while it is on