Disabling Adsense is a [PRO] feature only available with a valid license. Without a license key you’ll see:
License Information:
No valid license found. Get one from *here*.
Google Adsense impressions will be shared 50/50.
Buy or renew your Pro license to get 100% of the Google Adsense impressions
or to disable Google Adsense if you prefer to keep you site free of ads.
*here* links to https://www.lars-schenk.com/shop
With a valid license key you will see something like this:
Your Google Adsense Publisher ID will receive 100% of the impressions.
To disable Google Adsense let the Publisher ID empty.
A license key is mandatory for businesses and commercial sites.
For others the license is optional and unlocks the pro features.
Features as taken from the readme and
https://www.ads-software.com/plugins/responsive-flickr-gallery/
[..]
* Pro license required for businesses and commercial sites
* Pro license unlocks [PRO] features. No new installation required
* [PRO] Monetize your Flickr galleries with 100% ad impressions for your publisher ID
* [PRO] Disable ads
Background: This plugin donation ware before the 1.0.0 release – but unfortunately it turned out that this does not work. The switch to a licensing scheme will help to maintain the code and keep releasing new versions of this plugin.