Yes. All you need to do is create a board which includes all the projects (or even parts of projects) that you want to work with. The boards all run off an initial "filter to tell me what issues to look at"
The most obvious one is a project filter: "Project = XYZ". But you can easily change that to "Project in (XYX, ABC, HKL) , or go further and say "Project in (ABC, XYZ) and issue-type in (bug, story, feature)"
To complete Nic's answer - that will be done changing the Board filter query:
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