Hi Iversa,
Please refer to the steps below and see if it can meet your requirement:
1. Go to File > Options > Advanced, scroll down to Send and receive, clear the checkbox of Send immediately when connected:

2. Click the Send/Receive button next to the checkbox, clear the checkbox of Schedule an automatic send/receive every x minutes:

3. Press F9 to manually send/receive when you want to.
Hope this can be helpful.
Regards,
Yuki Sun
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