我怎么才能在 github 上看到所有我正在看的项目呢？

• Make sure you're logged in and go to https://github.com/watching
• Profit! ;-)

More information about this and related features can be in the official announcement

As commented by @xinthose, things have changed in 2020, including the fact we now have starred repos (which is often what you really want) and also different levels of watching.

For watched repos do the following (or enter URL https://github.com/watching as @nulltoken suggests). You will then wee your Watched repositories grouped by type of watch.

1. Click on the bell in the upper right

2. Select the Manage notifications in the lower left and then Watched repositories

For Starred repositories, click your avatar in the upper right and then select Your stars.