How to deal with zooming in and out of the canvas

Problem/Motivation

If you take a look at the bpmn.io demo page: https://demo.bpmn.io/new you notice three buttons on the lower right - one for zoom in, one for zoom out and one to reset back to 100%. Aside that you are able to simply use cmd + and cmd - to zoom in and out as well as cmd 0 to get to 100% via the keyboard controls. with https://bpmn-io.github.io/bpmn-js-token-simulation/modeler.html?pp=1 those buttons are missing but you are also able to zoom in and out as well as reset to 100% via the keyboard. on both pages the keyboard controls refer to the zoom level of the canvas - the toolbar, property pane and buttons are not affected.
In contrast if you try the same in eca you first think the zoom does work the same way like in the second link until you notice that not the canvas is getting zoomed but the whole page (the drupal admin toolbar, the drupal header as well as the bpmn_io interface elements like the toolbar, property pane and the button are getting zoomed).
That is sort of a tricky problem since the drupal admin interface and the canvas are paired control wise and the user needs the ability to adjust the zoom level of the whole page. but in that particular case the need "i want to zoom in the page to have bigger controls and content to read" and the need to "zoom into a huge model to be able to work on a smaller part" isn't aligning well. no good idea how to handle that yet. just wanted to post it for discussion when i've noticed today.