Depending on the effect you want to achieve, you can:
crop the source ("Alt+LeftMouseButton" drag over any corner of the source or in the Transform > Edit transform > Crop right-click menu over the selected source)
add the "Crop/Pad" filter to the source (right-click menu over the source, the Filters option)
If you set too small canvas (see last option above) then, obviously, OBS will record only small part of the full size of the source. If you need full screen - set canvas to match your screen resolution. Set canvas to device original resolution, usually it is 1920x1080 (you can type any value up to 4K).
What stopping you from changing the size of the Canvas in OBS? If canvas is 640x480 you can place on it video source which size is 640x480. If you have canvas 1024x768 you can place 1024x768 source on it. If you cut your source to 512x256 then you can set canvas to 512x256.
OBS "Settings" can be opened from the "Controls" panel (the button "Settings" below "Studio Mode" button) or from the main menu "File".
There is too options in the "Video" section of the "Settings":
"Base (Canvas) Resolution" in format Width by Height, in pixels;
"Output (Scaled) Resolution" in format Width by Height, in pixels.
Canvas - is place where all the graphic sources lie. A smaller sources can be placed side by side if the canvas is large enough. Some large sources can lie beneath smaller sources (like picture-in-picture) and so on. Output - is final size that saved in a file/stream, it usually should match the Base (Canvas). Sometimes, users need a larger canvas (full-screen 4K display) that is scaled down at the output (for example, for 720p HD streaming with lower bandwidth requirements over a busy network). Here, lower resolution = lower network bandwidth requirements.
If you remember, OBS is a tool for streamers and gamers, so there are so many options. To learn more about OBS:
OBS (Open Broadcaster Software) is free and open source software for video recording and live streaming. Stream to Twitch, YouTube and many other providers or record your own videos with high quality H264 / AAC encoding.
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