The demigods, being thus advised by Brhaspati for their benefit, immediately accepted his words. Assuming forms according to their desire, they left the heavenly kingdom and scattered, without being observed by the demons

Expressions researched:
"The demigods, being thus advised by Brhaspati for their benefit, immediately accepted his words. Assuming forms according to their desire, they left the heavenly kingdom and scattered, without being observed by the demons"

SB Canto 8

Śukadeva Gosvāmī continued: The demigods, being thus advised by Bṛhaspati for their benefit, immediately accepted his words. Assuming forms according to their desire, they left the heavenly kingdom and scattered, without being observed by the demons.

SB 8.15.32, Translation and Purport:

Śukadeva Gosvāmī continued: The demigods, being thus advised by Bṛhaspati for their benefit, immediately accepted his words. Assuming forms according to their desire, they left the heavenly kingdom and scattered, without being observed by the demons.

The word kāma-rūpiṇaḥ indicates that the demigods, the inhabitants of the heavenly planets, can assume any form they desire. Thus it was not at all difficult for them to remain incognito before the eyes of the demons.