You can delete specific pages from the history list in the Safari web browser in macOS High Sierra. It’s easy.
- Launch Safari. Select Show All History in the History menu or press ⌘-Y.
- Find the page you want to remove.
- Hold down the Control key while pressing the left mouse button.
- Choose Delete from the contextual drop-down menu. You can also right click on an entry and select Delete.
(This how-to is based on my experiences and info on Apple's support pages — where the images sometimes come from.)