Please refer to the following

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Type installed on the ceiling

In the case of a type installed on the ceiling, you can disconnect by turning the cover counterclockwise.

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Type installed on the wall

In the case of the type installed on the wall, you can remove the cover by removing the screw at the top of the cover.

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Below in an example of remove of Type installed on the wall

For the following types, you can remove the light bulb from the top without removing the cover