When you right click over specific cell of the image in the main window, you will activate context popup
menu.

First option of this menu is to show original image used as a tile in a new window.
Note: Active only if cell already rendered.
Second option is to erase current tile.
Note: Active only if cell already rendered.
Third option is to find this tile in the Library inspector.
Note: Active only if cell already rendered.
Tip: It is useful function when you spot an undesired tile that you don't like to use anymore. In this case
you may find this tile in the Library inspector, delete it from library
and recreate mosaic. For more info
see here.
Below is a list of a candidate tiles for replacing the current tile.
Note: Candidate list are visible only if option to show candidates
is on.
When a range of sells is selected you will get another set of options:
Render selected sells - i.e. render cells inside selection.
Erase selected sells - i.e. erase all cells inside selection.
Save selected sells as a mosaic image - i.e. save selected cells in supported output file format.
See also:
Main screen menu