Hi @stevelp,
I don’t know if that can be reset in the preference GUI, but you can export your KNIME preferences from the File menu under “Export preferences…” If you have a look at the exported file, there should be a line like this:
/instance/org.knime.workbench.ui/knime.metanode.updateOnLoad=never
If you remove this line and then import the settings again, KNIME should start asking you to update when opening a workflow. You can also set the value to “always”, if you prefer.
Kind regards,
Alexander