vith

Flip Horizontally for the whole canvas is a must for me, and is found in almost all of the drawing apps.
It's the fastest way for assuring/fixing perspective problems in drawings and it feels to me like a mandatory feature. 
An accessible button/menu-drop for the flip would make this Affinity Designer my go-to app for pixel drawing, besides being the killer app for vector drawing.
Please make it happen .
 
Best Regards,
Amir