It sounds like you want to remove the trendline from the legend in your scatter chart. Here's how you can do it:

1. Click on the chart to select it.
2. Click on the "Chart Elements" button (the plus sign icon) that appears next to the chart.
3. Uncheck the box next to "Trendline" in the "Chart Elements" menu. This will remove the trendline from the legend.
4. If you want to keep the trendline on the chart but just remove it from the legend, you can right-click on the trendline and select "Format Trendline" from the context menu.
5. In the "Format Trendline" dialog box, go to the "Options" tab.
6. Under "Trendline Name", uncheck the box next to "Display Equation on chart" and "Display R-squared value on chart". This will remove the trendline name and equation from the chart, but keep the trendline itself.
7. Click "Close" to apply the changes.

That should remove the trendline from the legend and keep it on the chart without any extra clutter. Let me know if you have any other questions!