Take Office Word 2007 as an example. When you need to open multiple files in the Word window, you can go to Word Settings-Advanced Settings-Uncheck "Show all windows in the taskbar"-OK. After setting, all open word windows will be merged into one Word window. The following uses Word 2007 to demonstrate the operation process:

First, first, open the location of the documents and open them one by one. Here are three blank Word documents to demonstrate.

Second, as shown below, after opening, it will generally be divided into three word windows and stacked together. If you want to merge, click the "Office button" in the upper left corner of any window.

3. Click Word Options in the pop-up menu.

Go to "Advanced" settings, find "Show all windows in the taskbar", uncheck this item, and click "OK".

5. As shown below, after the above settings, no matter how many Word windows are opened, they will be merged into one window (all documents will be opened in one window in the future). If you need to change back to multi-window mode, just check "Show all windows in the taskbar"). When you need to switch, click to enter the View tab.

6. Click "Switch Window" to pop up the document list, and then click the corresponding document to switch.