Do you really want to use the GUI? Did you consider using scripting with its synchronize command?
https://beta.winscp.net/eng/docs/scriptcommand_synchronize

If you want to use GUI, you can use /rawconfig to disable the checklist.
https://beta.winscp.net/eng/docs/rawconfig

I use winscp to synchronize a folder from my local PC. I want to do it auomatic in a batch-file
with this script: "C:\Program Files (x86)\WinSCP\WinSCP.exe" xxxxx /defaults /synchronize "C:\Users\xxxx\Documents\test" "/users/xxx/test"
"exit"
It works correctly, but at the end or during the execution I get the output like the attached file. So I must press a key or I must agree to do it. Can I automate it by using parameters?

Klaus

Now I see that when the option Preview changes is enabled the checklist is not shown. But when winscp is closed the option changes to able the checklist. What settings are necessary that the option is everytime enabled?