MS Power Point
To change font size of a selected slide title, you:

Click Format, Title and choose a font from the font tab
Click Title, New Font, OK
Click the toolbar’s Increase Font Size button
Click the toolbars Font dropdown arrow and choose the font you prefer

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MS Power Point
What is the use of 'Hide Slide' option?

to hide the selected slides during Deleting
to hide the selected slides during Editing
to hide the selected slides during Printing
to hide the selected slides during Presentation

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