It is possible to put a campaign in read-only mode in the Toovalu Impact administration.
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The action of putting a campaign in read-only mode allows changing the permissions of the collectors. Indeed, when clicking on the "open book" icon, all collectors will then be granted "reader" permission on the 2020 campaign. This action thus allows for data sanctuarization on the selected campaign.

Thus, your collectors will be able to continue collecting data on another campaign while being readers on the campaign put in read-only mode.
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The action of putting a campaign in read-only mode does not block your access to the possibility of modifying the data; this action only applies to users with collector access.