Deleting Picasa albums on Samsung devices is almost the same as the same but different according to the device menu options. Go back to your home screen, then to the gallery and confirm that the Picasa album is no longer there and you’re done. Turn the sync off or deselect Google photos (or Picasa albums), Google.
Here is a simple guide on How To Delete Picasa Photos from Samsung Galaxy S6. Scroll down to gallery, tap on it and select 'clear data' then tap OK. Go to Settings, then Accounts and choose Google.
After deleting the data, let the gallery update and you will not be able to see Picasa photos from the gallery.The easiest way is to use the Android Photos app. From all tabs you need to find gallery when you click it, you’ll see the Clear data option. There are a few ways to delete Google Picasa photos from an Android phone.Now go back to Setup and go to Application Manager Signing with your Gmail id that you entered in your android mobile phone Click on the Picasa web photo or albums that you want to delete permanent.Now select Google and below, uncheck “Sync Picasa Web Albums.”.Go to Settings, select account and sync options from there.
If you want to delete Picasa photos from your Smartphone, this guide will be very useful for deleting Picasa on the Samsung Galaxy S6: How To Delete Picasa Photos from Samsung Galaxy S6 How To Delete Picasa Photos from Samsung Galaxy S6 – When you create or set up a Google Account using your Android device, if your Google Account is synced to your device and Picasa Web Album Sync is enabled, you may be able to see Picasa photos in your device gallery.