Avoid long text strings
It is easier for an audience to read and assimilate a message if the text strings do not span the entire width of the screen, especially if there is a lot of text on the slide.
A good alternative is breaking the text up and placing it in a table. Take the first level of text (bullets?) and place it into the table column on the left, and take the subordinate text (indented dashes, etc.?) and place it into the table column on the right. You now have a horizontally oriented text slide instead of one that is vertically oriented. Each first- and associated second-level text should occupy their own row within the table.
Your slide now reads easier than a single large and cumbersome text field. The width of your text strings have been reduced in the process.