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I suspect that you have run a plugin or otherwise disabled the "Highlight" button.
To get it back, go to Preferences / Searching and check the "Show a quick toggle button to switch between highlighting and restricting results next to the Search bar" box.
While, you are there, you can also uncheck the "Highlight search results" box.
This is assuming that what you are calling a Filter button is the one highlighted in the attached image.
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