Quality of recorded video is low
Open Settings -> Preferences -> Video menu in Screen Capture and set Frame rate to 60. Make sure that Output frame size is set to Full Size. Close program settings and record sample video, after recording check video quality in Screen Capture preview window.
Please note that if you record HD / Full HD / WQHD / 4K video (for example, from YouTube) you need to select appropriate output format (Save as option). To save HD / Full HD / WQHD / 4K video in high quality select Video and audio -> HD video format group from the list of formats and then select one of formats with 720p / 1080p / 1440p / 2160p quality. Save your recorded file and check quality of output file.
If after recording your screen in Movavi Screen Capture Studio or Movavi Video Suite you go to Edit your video, please make sure to set the resolution of video editor's project approximately the same as the resolution of the video you have captured. You can set resolution of the project in Edit -> Project settings.