Draytek Vigor2926L User Manual page 590

Info
4. The following page allows you to modify related settings for 2.4G SSID of managed AP.
Make the changes you want for 2.4G SSID. Click Next for next page.
574
Apply to All APs can automatically apply the settings on Default
profile to all of the access points registered to Vigor2926 later.
Hence, it is not necessary for you to manually apply wireless profiles
for APs respectively. Such feature will be convenient for people who
want to quickly deploy multiple Vigor APs in a large exhibition to
reach the goal of "plug and play" and "zero-configuration".
Vigor2926 Series User's Guide