Configuring gThumb
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gThumb > Menu

- Enable "Hidden files".

gThumb > Menu > Sort By

- Select "file name".

gThumb > Menu > Preferences > General

- Disable "Statusbar".

gThumb > Menu > Preferences > Browser

- Enable "Name".
- Enable "Double click to open files".
- Enable "Open files in fullscreen mode".

gThumb > Menu > Preferences > Viewer

- Set "Transparency" to "Gray".

gThumb > Menu > Preferences > Shortcuts

- Assign "Delete permanently" to "Delete".

gThumb > Menu > Preferences > Extensions

- Disable all extensions except "File manager".