Im not sure about what you mean with distracting zoom effect. Anyways, it is possible to go back to the old "awesomebar" [1].

1. Visit about:config

2. Find and change the value of following preferences to false

browser.urlbar.openViewOnFocus

browser.urlbar.update1

browser.urlbar.update1.interventions

browser.urlbar.update1.searchTips

[1] https://techdows.com/2019/10/mozilla-enables-megabar-design-...