I am trying to visualize how many Sentinel 1 scenes there are in Bolivia and Sumatra between October 2014 and May 2016 in the EO Browser. It only shows a few scenes for this very large time range over the whole world and no scenes for my areas of interest. I think it should have global coverage, according to these docs that state the whole archive is available on Sentinelhub: https://docs.sentinel-hub.com/api/latest/data/sentinel-1-grd/
If you are searching with Default options, you are searching AWS archive, which only goes back to 2017, with only a few scenes available beforehand. The EO Cloud option should be larger.