Some filters do not work (wave, wavelet-denoise, sepia-tone, shade, shear, solarize, spread, swirl, modulate(modulate)).
Filter "Fun (Abstract oil painting)" changes also picture in Dropzone, and "undo" not helps to restore view, it stucks there.
For "Create new Template" you should write some instructions, some help text.
After using some "Template" (nonsence template actually) I got emty tamplete window and after closing it I got this:
And I can not nor delete nor edit template.
And I think there is no need for splitting app's menu in two-three groups. You can do menu like this:
App Edit View Help | Align Blurring Colors Effects Sharping Size Other Templates
App Edit View Filters Templates Help