solid line
To add text to a placeholder, first select the placeholder in your document or presentation. Then, click inside the placeholder box and start typing your desired text. You can also copy text from another source and paste it into the placeholder. Finally, format the text as needed using the available text formatting options.
A left-aligned paragraph places the first character of a text line near the left border of a placeholder.
Placeholder
A content placeholder is typically indicated as selected by visual cues such as a highlighted border or outline around the placeholder. It may also show additional controls or handles for resizing, and the text within the placeholder may change color or become bold. In some applications, a blinking cursor may appear, indicating that the placeholder is ready for text input.
When you type text in a placeholder in Microsoft PowerPoint, it becomes a text object
Alignment ist he horizontal placement of text in a placeholder in PowerPoint.
If you add more text to a placeholder, like a text box, than the placeholder can contain, text resizes to a smaller font to fit in the placeholder. That is Autofit.
placeholder text
When you click the dashed border of a placeholder it displays as a Solid line.
the Autofit Options button
the Autofit Options button
Place the cursor in the paragraph. Apply the border to the relevant page element. Customize the border. Select the type of border you want to insert.