Unfortunately, developers are not able to request a specific ad size with our cross-platform plugins at this time. The cross-platform plugins use logic to determine the ad size based on the device type in order to provide customers with an optimal ad experience.
As for clarification to the two AdFit options: FIT_SCREEN_WIDTH will select the best ad size and stretch it across the entirety of the screen; FIT_AD_SIZE will select the best ad size without stretching it to the screen, so users may see the side edges as if it's a floating banner.
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