A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Are you referring to the Transform effect used to curve or reshape text, or a different PowerPoint feature? Also, are you using the PowerPoint desktop app or PowerPoint in a web browser? If possible, please share a screenshot of the ribbon with the text or object selected, hiding any personal information.
If you mean the text effect, try this in the desktop app: select Insert > WordArt, enter and select your text, then choose Shape Format > Text Effects > Transform. The Shape Format tab appears when the WordArt is selected. If you’re using PowerPoint in a browser, select Open in Desktop App and try there; WordArt effects are not fully available in the web version.