How to add a preview in Google Chrome

pu1. You can't add it on purpose, but it's automatically added if it's a site you go to often

2017-12-26

OK

pu2. No artificial additions. Just use it often and wait

2017-12-26

OK

pu3. There is a way to forcibly add it to the preview in Chrome, but you can do it as below.
1. Delete all unused previews
Repeat entering the site you want to enter several times
Shut down 3 chrome completely. At this time, if you look at the taskbar clock, there are cases where Chrome is executed in the background, but end this as well.
And if you do the chrome, it's done!
If it hasn't come out yet, repeat it again
It may take some time before it is actually reflected. It'll be in a few minutes, so wait a little bit and if it doesn't work, you can repeat it again

2017-12-26

OK