you mean "forget network" for other WIFI
SLT-Fiber is your wife, turn on auto-reconnect for that. She's coming whenever you want.
Dialog-4G, Mobitel-4G are side chicks; you can't forget about them. But if you turn on auto-reconnect for them, bitches going to replace wife.
Turn off auto reconnect for other wifi chicks and you're safe with complete control over them
there's little tick for that, available on every system out there