I have sent BTC to my new bisq wallet but they are not showing

The BTC do not show in the wallet in the bisq app.

The transcation has shown up in blockstream.info

This may be due to a connection issue.
Settings/Network Info/Resync SPV Chain should do the job.
Please tell us how it works.
(I presume you have v0.9.1)

https://blockstream.info/address/1Ke9iXdxpaKNiooa6E8W4auvumiC6ivqWc