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Sometimes while working in the back-end editor on pages or templates that include a View block, the Update button is greyed out, inactive, and it is not possible to update or save the page.
We have a fix for this in development that should be included in the next round of plugin updates.
In the meantime a simple workaround is to toggle between screen sizes in the upper toolbar, e.g. switch to Tablet and then back to Desktop, and that is normally sufficient to unlock the Update button.