click on the left image to see the full screenshot.
Photobie interface is flexible, For example you can click on the slider indicated by 1 in the left screenshot to hide the bottom thumbnail panel and the right paint panel. You can also drag those sliders to expand or shrink these two panels. You can click on minimize icons indicated by 2 as above to minimize the color palette or the paint tool box. If you have multiple images opening, you can click buttons indicated by 3 above to arrange the layout.

click on the left image to see the full reference

This is a quick UI reference for the tool on the Top left toolbar.

click on the left image to see the full reference

This is a quick UI reference for the region selection tool.

click on the left image to see the full reference

This is a quick UI reference for painting tools on the right toolbar.

click on the left image to see the full reference

This is a quick UI reference for the Layer Manager.