Friends. I am completely new in the configuration of mikrotik equipment wirelessly, how do I set 300 meters or 0.3 km, which is the distance from the AP to my station?

https://help.mikrotik.com/docs/display/ROS/Wireless+Interface#WirelessInterface-Overview
Scroll down to distance.
What RouterOS version is it? I don’t recognize it…
ROS 6.49.7
The screenshot is not from 6.49.7…
Leave it dynamic, so it does the correct calculation automatically.
The unit is kilometers, so for 0,3Km it is 1, because it is not possible to enter floating point values…
1Km = 4.33µs
(0Km = ~1µs but your device is not fast and close enough for reply…)
What do you expect by changing it???..
This parameter is for kilometer connections,
There is nothing to do with for distances of less than a kilometre…
Thanks for your answer friend REX, and for that distance what power do you recommend?
For distances up to 1 km it is better to use Indoors.
When setting up the radio bridge, the power is set according to the level of the received signal. The optimum is 50-55 dB. you should strive to get the same Tx/Rx values and the same in channels ch1 ch0
I do not know the two devices used.
Probably “8” suffice
This is my station
What power should I put on my equipment?

-65 ??
do not touch any… (the router identity is visible…)
I don’t understand REX
I don't understand what you mean by this friend REX.
What devices do you build your Radio Bridge on?
If you don’t know anything about wifi, just leave it as it is.
There is too little information to be able to give advice.
The quick setup menu can only be used once, after that it is not recommended to change the settings through it.
More informative tab Winbox/Wirelless/Registration double click on the desired line and in the menu that opens tab Signal