What said above.
In addition, to make the 'proprietary' diagonal, you will need to use
wordart.
In slide master, select Insert > Picture > WordArt.
Click on the second wordart and click ok.
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Microsoft Certified Office Specialist (PowerPoint)
Missed out textbox, my bad. For textbox, select Draw > Rotate > Free Rotate.
Then, hover over the green dots and tilt the text.
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Microsoft Certified Office Specialist (PowerPoint)