Hello Watercolorheart and welcome to the ArtRage forums
The Canvas Positioner puck, which can be used for zooming the canvas, can be accessed via it’s icon, just to the left of where the current Zoom level is displayed at the right-hand end of the top Menubar.
More detailed info on the various Key combos used for zooming and moving the canvas around can be found here: https://www.artrage.com/manuals/the-canvas/
Maker Of Replica Macoys
Techie Stuff:
ArtRage Vitae 7.1.4 ~ 15" Macbook Pro ~ macOS 10.15.7 ~ 4 Core i7 3.1GHz CPU ~ 16GB RAM ~ Wacom Intuos4 M