I2c and esp chips

Hello…

I bought some d1 minis and i2c shield oled displays.
They work wonders right out of box soldered on top with all pins in…
So i guess they know by themselfs which pins are for them. But as soon i attach another i2c device like a sdc30 display doesnt work anymore and logs say that the dispaly was not found…
I found some hints about multiple i2c setups possible on the esp chips, as far i got it by specifying different pins to different named id’s but i also found that not all esp chips have the ability for multiple i2c setup…
On my d1 mini i have a esp-12f chip and i cant find anywhere a destinct answer if this chip can do multiple i2c connection sor just one…
All i found is that esp32 has 2 and esp8266 just 1.
But what family is the esp-12f and how would i tell the display which pins are for it and which pins for the sdc30?
I mean the sdc30 code already says how to configure the i2c “port” for it, but the ssd1306 display does not.

Thx alot for shedding some light to the my drama