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The further right tab on the Quality Score Tracker includes two options to optimize your quality score:

This optimization feature uses rule-based algorithms to find those keywords that have a low quality score, and which are not driving any conversions. You can set your custom minimum threshold for conversions and QS to find the low performing keywords, apply a label to them, and pause them. You can find more details here.

Improve performance of low quality score keywords by adding them to their own single keyword ad group (SKAG).

In the Keywords tab, you'll see the top spending keywords in the account with their own particular metrics, such as how the Quality Score has changed, keywords, ad relevance, and more. 

With this performance information, you can choose to take one (or more) keywords and convert it to a SKAG for its optimization, by pressing the icon next to it. 

You have the option to edit the respective RSAs while creating a SKAG for a particular keyword. Click on the Edit button present on the Ad preview displayed in the SKAG creation settings.
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You will now be able to add, remove, or pin headlines and descriptions as well as edit the URL and path for Ad. The tool also shows suggestions for new headlines on the right side. You have the option to choose between AI-generated suggestions or suggestions from already existing ads.

You can check some frequently asked questions here, and you can read about troubleshooting questions here.