How can I change the hotspot channel bandwidth to 40 or 80 (my wifi controller is Intel Corporation Wi-Fi 6E(802.11ax) AX210/AX1675* 2x2 ))

[willpbr (Willian PBR)]

[gnwiii (George N. White III)]

Rules for channel width vary with regulatory domain, see https://en.wikipedia.org/wiki/List_of_WLAN_channels. For a hotspot: https://www.marcusfolkesson.se/blog/linux-wireless-regulatory/.