Within Google results your main domain listing can display sub links to pages. You may wish to remove one of these, to action the change please follow the instruction below:
Demote a sitelink URL:
On the Search Console Home page, click the site you want.
Under Search Appearance, click Sitelinks.
In the For this search result box, complete the URL for which you don't want a specific sitelink URL to appear. (How to find the right URL.)
In the Demote this sitelink URL box, complete the URL of the sitelink you want to demote.