You need to select all files & subfolders pulled from /display/ and ZIP them to a single file.
Though I prefer 7zip, I use Windows built-in "Right Click > Send To > Comressed (zipped) folder" option for this.
Then you rename the .zip file to MyFilenameFromTheVTXFile.vtz.
Make sure you're actually changing the file extension & not just renaming (to FileName.vtz.zip).
Click Windows Start button and type "File Explorer Options" then navigate to the View tab.
Uncheck the box for "Hide extensions for known file types" if needed, prior to changing the extension from .zip to .vtz.
There is no guarantee the reconstructed .vtz will be viable after doing this.
Note that Toolbox doesn't have any official "Retrieve Project" for touch panels (like there is a "Retrieve Program" for control systems).
In most instances with newer panels (x52 and later?) this process typically works though.
You can try launching the .vtz in XPanel Desktop software to see if it will run prior to trying to load it to a panel.