Windows – Why don’t some of the tiles on Windows 8 Start Screen have the “larger” choice

1. Open the Clock, Language, and Region section from the Control Panel:

   

2. Open the Language panel:

   

3. Here we can see the issue:

   

   To resolve your language conflict, add a new language

4. Open the English language catalogue:

   

5. Pick whatever English language you prefer and Add it:

   

6. Open the Options for your newly added language and add a new input method:

   
   

7. Pick the Slovenian keyboard layout, add it and save your setup:

   

8. You can now Move up your new configuration and Remove the old one.

   

   Your date, number and time formats should still be set to Slovenian:

   

9. Restart Windows.

10. Success

    

Apparently the photos are selected from your library by some criteria that includes recentness, You can set one specific photo by bringing up the picture to being full screen, then bring up the app command bar( ctrl - Z , and selecting 'set as app tile'. Source: Tom's Hardware

As is there's no obvious way to select folders, so I'd guess the solution would be to store things you don't want turning up outside the library. Tweaking metadata to reduce interestingness might work as well, but thats an extraordinarily ugly solution, and one that would need further understanding of the criteria the app uses.

EDIT: Further investigation shows it uses your pictures library, and by adding a folder to your pictures library it shows up there. Likewise removing a library removes it from the 'playlist'. Quite simply the way to remove a folder from showing up on the photos tile is to remove it from the library, and adding a folder to the library adds it to the tile.

There does seem to be a certain amount of 'lag' between changes in the library structure, and photos catching on with it.