By default, clients can accept a proposal without providing a signature. If you need a formal signature (typed name + canvas draw), enable it per proposal.
Enabling the requirement
Open the proposal in the editor → select the Cover block → in the Block inspector look for Require signature under Proposal settings → toggle it on.
Alternatively, select the Investment (pricing) block, the same toggle is mirrored there.
Tip
For high-value engagements, always keep Require signature on so you have a binding e-signature audit trail before delivery starts.