It needs to set same Security level in all zones. To do that follow the steps below:
- Open IE
- Go to Tools -> Internet Options -> Security
- Set all zones (Internet, Local intranet, Trusted sites, Restricted sites) to the same protected mode, enabled or disabled should not matter.
Finally, set Zoom level to 100% by right clicking on the gear located at the top right corner and enabling the status-bar.
Default zoom level is now displayed at the lower right.