Troubleshoot custom expression disappears when switching to Sequence Builder
When you create or review an expression in the Custom Expression Builder and switch back to the Sequence Builder, the Sequence Builder re-configures the sequence—it does not interpret the custom expression text. In this case, switching to the sequence builder will discard any changes made in the custom expression.
However, if a sequence built in Sequence Builder contains an error, viewing it in expression mode may be helpful in troubleshooting internal sequence dialog errors. Click an error link to open and edit the expression in the Edit Expression dialog. This process will not reconfigure the sequence.