(This “How To” applies to Google Chrome v89 and later. Here’s how to find your Google Chrome version if you need it.)
In Google Chrome, type or copy the following link into your address bar and press Enter: chrome://flags/#read-later
(Note, using the address bar is necessary because Chrome doesn’t appear to treat this link like a normal web link.)
You should see something that looks like this:
In the drop-down, select the option you would like: “Enable” or “Disable”
You may need to relaunch Chrome for the change to take effect. If Chrome prompts you to do this, go ahead and do it.
The Reading List should now show or not according to your choice: