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Microsoft 365 and Office | Word | Other | Windows
A family of Microsoft word processing software products for creating web, email, and print documents.
Although the question you posted in was also about paste options, you are actually asking about a different thing. The other thread was about the keyboard shortcut to paste as plain text. You are asking about having the default be to Merge Formatting as described in a third-party webpage. I've split your question into its own thread so you can get quicker and better answers.
How to Ask Questions In this Forum (to get the best and quickest answers)
I am assuming that you are using the Windows desktop application. If I am wrong about this, please say something.
You can change the default paste option yourself in File > Options > Advanced. These can be set to vary depending on the source of the material being pasted.
When pasting, if you have the Paste Options button enabled (Step 5 in the screenshot) you can use that to vary from the default.