Problem with Avalon Slave Template

Simply don't use the component editor.

You'd better modify directly the _hw.tcl file. This is usually faster and safer than the component editor.

The tcl file contains a number of directives which allows you to set some component parameters in the property window (e.g. data width, number of registers, ...). Some of them are obsoleted and deprecated by newer tools.

If you need a fixed configuration, you can discard them and set constant values into the tcl file.