Go to the top right of the Chrome window and click on the 3 dots or the exclamation point.
Choose "Settings" from the drop-down menu...
It opens in a new tab/window. Set it to show Bookmarks Bar.
Scroll to the bottom. Under On Start Up, select "Open a specific page..." button - then click on "Use current pages".
Click on the 3 dots to the right of this webpage and "remove"; you want to keep the Moodle page only.
You can close the Settings tab/window.