There are many ways to open tables in Entrance. One way is to double click a table in the Entrance explorer tree. Another is to select a table from the Database | Open table... dialog, which maintains a list of tables you have recently visited.
Using the "Match Box"
With a table displayed, you can enter text in the match box (in the upper right corner of the window), and only rows containing the text will be displayed:
You can also enter a WHERE clause in the match box to limit the display: