The reason why it is ready only because the page variant containing it is locked in read-only mode. To edit the script, duplicate the page first, just like you did for the Record Information page previously.
To create a duplicate for that Open the page collection ->SOW-Side bar Tabs Top
Open Record Information Page which you duplicated earlier or else OOB one, scroll down to the bottom on the left side until you found Caller Records Viewport
click on that and on the right side configuration you see something like below
click on that icon as showed in that above image and open the variant named as Caller Records Default and duplicate that and now you are able to edit that client script.Lastly inactivate the OOB Caller Records Variant.
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Want to Change this script so it will show 100 days of data instead of 7 days of data it is showing right now when we click Recent Task view All.
