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The mobile app is not KeePass, it is most likely a third-party app that is file compatible with the KeePass database file format. Check the features for the mobile app (whichever one it is) to determine if you can change the database master password or an open database without knowing the original master password. Since the master key is used to encrypt a KeePass format database is must be open to change the master key, but the other details for changing the master key is up to the mobile app developer....

The developer's KeeAutoExec plugin is very handy for managing multiple databases. There are at least two convenient ways to use this plugin. Create a dedicated Auto-Open Database. This database contains the entries needed to manage all your other databases. The Auto-Open database can be configured to open one or more working databases when you open the auto-open database. Databases that aren't initially opened will be added to a menu of other that are also managed by the auto-open databases. These...

The developer's KeeAutoExec plugin is very handy for managing multiple databases. There are at least two convenient ways to use this plugin. Create a dedicated Auto-Open Database. This database contains the entries needed to manage all your other databases. The Auto-Open database can be configured to open one or more working databases when you open the auto-open database. Databases that aren't initially opened will be added to a menu of other that are also managed by the auto-open databases. These...

What are the specific issues that you are experiencing when sharing? You probably shouldn't be sharing your screen while your database is unlocked. However if you do, usernames and passwords can be hidden quickly (Ctrl+J and Ctrl+H toggles hiding). Passwords in particular almost never need to be displayed, even during normal use. The KeePass workspace can be locked quickly (Ctrl+L), preferably before you share. Finally if you are present while sharing, minimizing KeePass will hide the data from casual...

What are the specific issues that you are experiencing when sharing? You probably shouldn't be sharing while your database is unlocked. However if you do, usernames and passwords can be hidden quickly (Ctrl+J and Ctrl+H toggles hiding). Passwords in particular almost never need to be displayed, even during normal use. The KeePass workspace can be locked quickly (Ctrl+L), preferably before you share. Finally if you are present while sharing minimizing KeePass will hide the data from casual inspection....

What are the specific issues that you are experiencing when sharing? You probably shouldn't be sharing while your database is unlocked. However if you do, usernames and passwords can be hidden quickly (Ctrl+J and Ctrl+H toggles hiding). Passwords in particular almost never need to be displayed, even during normal use. The KeePass workspace can be locked quickly (Ctrl+L), preferably before you share. Hiding passwords and usernames prevents the most sensitive information from being directly visible....

What are the specific issues that you are experiencing when sharing? You probably shouldn't be sharing while your database is unlocked. However if you do, usernames and passwords can be hidden quickly (Ctrl+J and Ctrl+H toggles hiding). Password in particular almost never need to be displayed, even during normal use. The KeePass workspace can be locked quickly (Ctrl+L), preferably before you share. Hiding passwords and usernames prevents the most sensitive information from being directly visible....

See: https://sourceforge.net/p/keepass/bugs/2450/