https://magento.stackexchange.com/tools looks like this ... FF 66.0.3
Can someone check pls?
As part of the site redesign we made the network responsive - which means that the page scales to the width of your browser window with a max width. If your window is narrower, we adjust the center section to allow it all to fit without side scrolling. When we made this change, however, we weren't able to make every type of page responsive at the same time. Moderation pages like the Tools page are part of the pages we haven't touched yet.
We'll be fixing the rest of the pages over time to make them responsive. It's a pretty laborious process because there are so many different pages, some easier to make responsive than others. We're also trying to do this the "right" way. Rather than just making a page responsive, we're trying to update the page to be sure that it's doing what it needs to be doing and looks good and is actually usable.
Thanks for the report and for bearing with us while we go through this transition!