how do I filter conversation -conv- command in Tshark version 3.0.0

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I don't know if you can do this in Wireshark (I don't think so), but you can get pretty good results using tshark I think. For example:

tshark -r file.pcap -z conv,tcp -q

This will produce output such as follows:

================================================================================
TCP Conversations
Filter:<no filter="">
                                                           |       <-      | |       ->      | |     Total     |    Relative    |   Duration   |
                                                           | Frames  Bytes | | Frames  Bytes | | Frames  Bytes |      Start     |              |
192.168.112.101:39611      <-> 69.4.231.52:http             20545  26190636   13022    707804   33567  26898440     0.000000000        32.8158
================================================================================

With the capture file I tested, there was only a single TCP connection; therefore there's only a single row of data in this output.