We are currently working on a global search and replace feature, but there is nothing that will exactly fit with what you want right now.
For the brave: there is a way to modify the raw XML of a window, but it’s not for the faint of heart. Always make a backup of your windows before attempting an operation like this. If you make a mistake, it is VERY hard to find and fix, and it’s very easy to cause deserialization errors when you manually modify a window. If you hold shift and right-click a window two extra options show up: ‘Copy XML To Clipboard’ and ‘Set XML From Clipboard’. You can use these to copy, modify and paste the XML back into your project using any text editor with a search and replace function.