maybe little bit complicated but working solution
1. go to POI manager screen
2. tap fitler and check hide found
3. now select all (2nd button)
4. tap filter again and uncheck hide found
5. invert filter now (3rd button)
6. move selected points to another category (last button > move)
1. go to POI manager screen
2. tap fitler and check hide found
3. now select all (2nd button)
4. tap filter again and uncheck hide found
5. invert filter now (3rd button)
6. move selected points to another category (last button > move)