In Texstudio's preamble section where I declare my packages, I have noticed that some of the texts are highlighted as orange.
There are no errors when compiling the document.
Can someone explain this curiosity?
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TXS checks all LaTeX commands in the document for validity. This helps you recognizing errors (typos and not loaded packages) already while typing. If a command is marked as unrecognized, TXS did not find a definition for it.
See the above link for more details.