Recovering A Project When An Option Has Been Mistakenly Been Selected In Flying Pawn Blueprint [UE 4-27]

How can I recover/salvage a project when an option (Begin Tick On Activation for a Niagara System in a Flying Pawn Blueprint) has been mistakenly selected? Although the project can be opened, UE crashes everytime shortly after the project is opened. In addition, the message Discovering 4,000 Assets is seen in the Content Browser area. My PC is an Acer Aspire C24 with AMD Ryzen Processor (2 processors) with ATI Radeon Graphics Card and 16GB memory (All In One PC).

Is there a way of deselecting the option in the Flying Pawn Blueprint so that I can get back my project?