You can edit text in Slide View by selecting it and making the corrections directly into the slide
Select your text and use the Font group commands on the Home tab to modify font type and size.
Right-clicking on selected text will open a shortcut menu and you can edit your font with all the same commands as you would find on the Home tab.
The Replace Fonts command in the Editing group on the Home tab allows you to change a particular font throughout the whole presentation in one action.
The text alignment settings can be changed using either the Alignment commands in the Paragraph group on the Home tab, or the Mini toolbar.
You can locate and change text using the Find and Replace commands in the Editing group on the Home tab.