If there are multiple thumbnails at the bottom of your page you can just click on the next image. If there is only one thumbnail and you have entered the information for that page, then you are finished with the batch.
If you are working on UK—Principal Probate Registry, 1858–1957 [Part O] there might be just one page per batch. If you have excess entries after you have finished indexing the page you delete the blanks using the trash can icon and then you can submit the batch.
To get the best answer to your question you should share the batch code for the batch you are working on.
The batch code is the group of letters and numbers at the end of the batch title. X9B9-6XX it will look something like this.