Why is PAC1921 not responding to gain settings changes?

In the GUI "PAC1921 High Side Current Sense and Power Monitor (ADM00592) GUI Software", having 'Enable Auto INT_EN' inactive keeps the PAC1921 device in the READ state (low power mode). Activating this push button solves the issue. As stated in section "4.2.2.1 ENABLE AUTO INT_EN" of the "PAC1921 High-Side Current/Power Sensor Evaluation Board User’s Guide":

"It is recommended that the “Enable Auto INT_EN” control be activated when using the GUI."

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Read the entire section for more information. Also, see section "4.4 Power States" of the user's guide, which is available on the PAC1921 product page.

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