Go to Preferences, Plugins, Device Interface Plugins, Your reader. Click on Customize Plugin. This will open a dialog with a few options. The first thing you will see is a list of formats. When multiple supported formats are in a book entry the one closer to the top of the list will be sent. If you prefer lrf to epub put lrf above epub in the list to have it sent. Select a format and use the up and down arrows to change their position. Also, the first format in the list will be used for auto conversion and if you uncheck a format it will be ignored as a format your reader supports.
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