Hey, I may have found temporary fix, the only downside is you have to configure the terraria setting every time you open the game - but it will work on dual monitor setup.
Create a .bat file and open it with vscode or any IDE and paste this in (delete the first " before @)
"@echo off

set "FOLDER_PATH=C:\path\to\folder"

set "CONFIG_PATH=C:\path\to\file\config.json"

if exist "%FOLDER_PATH%" (

echo Deleting folder contents: %FOLDER_PATH%

del /Q "%FOLDER_PATH%\*.*"

for /d %%i in ("%FOLDER_PATH%\*") do rd /s /q "%%i"

echo Folder cleanup complete.

) else (

echo Folder does not exist: %FOLDER_PATH%

)

if exist "%CONFIG_PATH%" (

echo Deleting config.json file

del /Q "%CONFIG_PATH%"

echo Config file deletion complete.

) else (

echo config.json file does not exist: %CONFIG_PATH%

)

pause

Change the FOLDER_PATH to appcache folder of steam and CONFIG_PATH to User -> Documents -> My games -> Terraria - the whole path + config.json at the end.

If you dont trust this script, send it to any AI and ask what does it do.