What does an XPS-viewer have to do with Chrome? Is it a part of an extension?

In any case, I'm glad that you found the source of the problem. Perhaps your finding will help other people that experience a similar problem.

Please see my comment here, which mentions a guide on troubleshooting killed programs:

https://rammichael.com/7-taskbar-tweaker-for-windows-10-may-2019-update/comment-page-1#comment-11872

Great, I'm glad that it's fixed now.

Regarding Chocolatey, no, I'm not the one maintaining the package.

Make sure you're not using "Combine taskbar buttons: When taskbar is full" in taskbar properties.

See my answer here:

https://tweaker.userecho.com/topics/329-decombining-options-dont-work-as-expected-with-the-combine-when-taskbar-is-full-configuration

The "notification area" part was added by me ;)

It wasn't clear that you were referring to the notification area icons. Currently, 7+ Taskbar Tweaker doesn't have related options. I changed the topic topic to "idea", perhaps I'll revisit it for one of the future versions.

Which grid are you referring to? Post a screenshot to clarify what you mean.

Thank you for the feedback.

Your suggestion is very similar to this one, so I'm closing it as a duplicate:

https://tweaker.userecho.com/topics/476-notification-area-on-all-displays-multiple-system-trays

Please see my answer in the topic above.

Thank you, I closed the other topic.