Welcome to the Q&A Forum

There is no option like

/en/index.html

The only adress where you can reach the english main page version is www.example.com/en/

The Quality Score is calculated every time when you make something with it. For example try to put to different ad group in same campign usually it gets higher score for a while. But it is not a real quality score. The real QS is calculated on base of impression and CTR.

The best what you can do is to not care about things like you mentioned - anyway almost everything which is under QS 5 in specific ad group is useless.

It is better idea to find for that keyword better landing page more structualized campaign/adgroup and write more accurate and relevant ad text.

Hopes it will help you

Best regards

Hello

i have a problem with one of the rules for robots.txt

i have a multilingual mutation of entire page on www.example.com/en/

I want to make indexable /allow/ the main page under /en/

but not indexable /disallow/ everything else under /en/*

Please help me how to write the rule.