To leverage an existing idea, simply create a new idea, type a few letters, such as "red flag laws" here to temporarily populate it, click Done and then click anywhere to open it. Next, look for the following button and click it:
Then, enter your search terms and choose the idea that fits your outline.
Pro tip: there is a "preview" arrow you can click if you want to look at
the idea in a new browser tab before deciding whether to select it.