This is unusual. I'll help you figure this out, but I need more information.
What version of Lightroom & the operating system are you working on? Please share a screenshot of what you see in the app.
Edit tools appear when an image is opened in the Loupe view & Edit mode is selected.
Here is the get started article to help you further: https://helpx.adobe.com/lightroom-cc/using/work-with-lightroom-mobile-android.html
Let me know if this helps,