Steps to reproduce:

1. Have Zabbix frontend open on ultrawide monitor occupying 1/3 of the screen or less (can also be reproduced by scaling the browser to take up 1/3 of the screen on a regular monitor and increasing scale to 125-150%)
2. Open Dashboard, click Edit dashboard and Add
3. Select any widget with "Show header" checkbox

Result:

Due to horizontal scroll three problems occur:

1. "Show suppressed problems" and "Hide groups without problems" labels partially hidden by their respective checkboxes;
2. "Add" and "Cancel" buttons are inaccessible without resizing window or using keyboard shortcuts;
3. "Show header" checkbox label overlaps with widget Type dropdown menu.

Expected:

1. All labels are fully visible;
2. "Add" and "Cancel" buttons are accessible by using horizontal scroll on the overlay window;
3. "Show header" checkbox label is not overlapping with Type dropdown menu and is accessible by using horizontal scroll

Versions, browsers affected:
Version: 7.0 only
Browsers checked: Chrome, Edge, Opera, Firefox