After you sit down at a table, you can’t just get up without sitting down at a new table.
There should be a way of getting up, without sitting down right away. Just like when you first join the conference, you aren’t seated yet.
I sit down at Table 1
I get up from Table 1 by clicking on my icon again (which basically takes me off the table)
Then I go grab my cup of coffee, or run to the bathroom, without sitting down at another table
Then later, I go sit down at Table 2