You can't get more than the top XX flows in any current version. However, you can increase the top XX to a maximum of 100 by clicking the Edit button on the appropriate flow resource.
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NTA is optimized to only gather the top 95% of Neflow traffic coming from any source so you will not be able to see "All" traffic. You can change this setting in the NTA Setting under this section:
As mentioned above you can also edit the "Top XX" view resource and change the XX value to list more if you choose.