Screen size problem. I run the game but it opens in a wrong size i only see half of game screen. How can i fix this?

5th campaign 1st Mission I am forced to destroy at least one enemy to rally the last tribe i need, but the cities are so big it is impossible to take a single building. After multiple hours on this mission, i attacked the blue ennemy with 1400 units, 900 archers and 300 riflemans and 200 pikeman and everything upgraded to the max + chiefs everywhere. As soon as i aproach, half my army is already running away, leaving me with only ~700 controllable units. Impossible to burn buildings because there is vil...

Related to the Pontiac's Rebellion first mission question below, has anyone completed this on Impossible difficulty? TL;DR Version: I was able to finish the 1st Russian mission by using the initial 10 archers to burn down a couple of their production buildings (well they cheat by producing from houses too), then have everyone else sail to the surrounding islands. Since you have to hold the fort in Mission #2 that strat is not viable. Dealing with the archers and armored warriors is annoying yet possible...

hay algun modo de que no desaparezcan los cuerpos o que durena mas muertos en el campo de batalla?

Here is my guide how to play old Cossacks and American Conquest on Win 8/8.1/10: https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2828683536