Greetings Seniordogee22,
There is not a way to remove the line from the bottom of the display. However, when you take a screenshot, you can edit and crop the photo right away so it doesn’t save with that line there.
When you take a screenshot and the thumbnail goes to the bottom corner, tap on it. It will open right away to the edit options. Then you can drag the bottom up just that little bit where the bar is, tap the Done button and it will save the screenshot, without the line, to your Photos app.
You can also edit a photo from the Photos app just as quickly. Here’s how - Take and edit photos on your iPhone, iPad and iPod touch
Thanks.